CN212256633U - Power switching control experiment table - Google Patents

Abstract

The utility model discloses a power switching control experiment table, including platform bottom plate, three horizontal tracks, power pack, switching power supply, PLC controller, at least one control switch and at least one relay. The power supply switching control experiment table utilizes corresponding control switches and relays arranged on the three transverse rails, so that the implementation of various simulation schemes can be met according to simulation requirements; the electric connection plug is electrically connected with the electric connection socket in a contact mode, so that a user can conveniently and quickly build a circuit, and the efficiency of simulation training is improved.

Description

Power switching control experiment table

Technical Field

The utility model relates to an experiment platform, especially a power switching control experiment platform.

Background

In the inspection and maintenance of the power system equipment, it is necessary to change the operation state of the system equipment due to a system failure, a maintenance safety requirement, and the like, and therefore the switching operation of the line and the substation is an extremely important task for the system operation and the work of the monitoring personnel.

At present, switching operation is a very mature technology in an electric power system, but due to the reasons of expensive equipment, complex structure and the like, resources for practical training teaching are very limited, so that students and related training personnel cannot deeply understand and learn switching operation.

The switching operation is a work for changing the running state of the electrical equipment, is a common operation for running a power supply system, and is one of key operations for carrying out equipment maintenance, ensuring continuous power supply of the system and improving the stability of the power system. The operation must be performed in sequence according to the characteristics and requirements of the power system equipment, and the sequence has strict requirements, and serious or even irrecoverable accidents can be caused by slight negligence or improper operation sequence, so that the switching operation is very necessary. Students and newly-enrolled staff who are rail major should be familiar with the switching operation of the substation in order to maintain and overhaul the equipment, even if the equipment fails, the on-site switching is performed, and the subway is always electrified and normally operates.

Switching is the switching of electrical equipment from one state to another or changing the way the system operates by operating disconnectors, circuit breakers and attaching and removing ground wires. In case of error in the switching process, severe accidents are brought, the consequences are extremely serious, equipment in a substation can be damaged, and the stable operation of the whole power grid can be influenced.

The switching operation is a complex and heavy task, sometimes the operation items are as many as dozens of items, once misoperation occurs, equipment damage is caused if the misoperation occurs, power failure occurs in a small range, and casualties and even systems are broken down if the misoperation occurs seriously. Therefore, the operator is required to have strong working experience, but the operator is inevitably in error under the influence of environmental, emotional and health factors, and the error probability is greatly increased when emergency situations occur or frequent operation is needed. In order to avoid the occurrence of misoperation, the power supply department strictly stipulates an operation rule and establishes a standard operation sequence. Various locking devices are also designed and manufactured around the country to prevent misoperation, such as mechanical and electromagnetic interlocking. Nevertheless, the occurrence of malfunction cannot be avoided. At present, an electrical operation ticket system is stipulated in China and is the most reliable and effective safety measure in the operation management of a power supply system. The power supply system can run safely and reliably, and the switching operation is safer.

In order to help track professional students and newly-enrolled staff to be better familiar with switching operation of a substation, personnel units need to train the students and the newly-enrolled staff on post education and electric operation, but as system monitoring equipment of a substation brain, operation faults of a subway caused by misoperation are worried about, the system monitoring equipment is not allowed to be used for learning of the new staff (particularly practice students), the training of the new staff and the students at school can only be learned through 'help transmission belts' of old staff or pictures and characters of teachers, the cognitive practice teaching effect of actual equipment is greatly reduced, and the expected teaching requirement cannot be met.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model provides a power switching control experiment platform can be convenient for carry out power switching simulation teaching, improves teaching efficiency, reaches anticipated teaching requirement.

The technical scheme is as follows: the utility model discloses a power switching control experiment table, including platform bottom plate, three horizontal tracks, power pack, switching power supply, PLC controller, at least one control switch and at least one relay;

the three transverse rails are transversely and fixedly arranged on the upper side surface of the platform bottom plate, and T-shaped sliding grooves are transversely arranged on the three transverse rails; the power supply box is fixedly arranged on the left side edge of the platform bottom plate, and a fuse protector and a leakage protector are arranged in the power supply box; a power plug is arranged on the power box, and an electric connection cable of the power plug is electrically connected with a power input end of the switching power supply; the fuse protector and the leakage protector are connected in series on an electric connection cable of the power plug; a T-shaped lug is arranged at the bottom of each of the switching power supply, the PLC, each control switch and each relay; the switch power supply, the PLC, the control switches and the relays are arranged on the T-shaped sliding grooves of the corresponding transverse tracks through T-shaped lugs at the bottoms; an electric connection socket is correspondingly arranged on the platform bottom plate and close to a power output wiring terminal of the switching power supply, a pin wiring terminal of the PLC controller, wiring terminals of the control switches and wiring terminals of the relays; a cable placing box is arranged on the front side edge of the platform bottom plate; each patch cable and each wiring terminal cable are arranged in the cable placing box; two ends of the plugging cable are both electrically connected with an electric connection plug; the power output wiring terminal of the switching power supply, the pin wiring terminal of the PLC, the wiring terminal of each control switch and the wiring terminal of each relay are respectively and electrically connected with each electric connection socket at the corresponding position through wiring terminal cables; the electrical connection plug is used for being plugged in a corresponding electrical connection socket and electrically connecting the two electrical connection sockets through a patch cable.

Furthermore, a longitudinal shaft is longitudinally and rotatably arranged on the left side edge of the upper side surface of the platform bottom plate through two hinged supports; a transparent protection plate is fixedly arranged on the longitudinal shaft; a strip-shaped seat is longitudinally and fixedly arranged on the right side edge of the upper side surface of the platform bottom plate through a fixing screw; a limiting notch is arranged on the strip-shaped seat; the right edge of the transparent protection plate swings rightwards and then is embedded into the limiting notch; a lifting handle is arranged on the transparent protection plate; a rectangular window is arranged on the transparent protection plate and positioned at the trigger button of the control switch.

Further, a microcontroller and an electric control switch are arranged in the power supply box; the electric control switch is connected in series with an electric connection cable of the power plug; a safety indicator lamp is arranged on the upper side surface of the power supply box; a tact switch is arranged at the bottom of the groove of the limiting notch; an electric control lock is fixedly arranged on the right side edge of the strip-shaped seat, and the lock rod end of the electric control lock extends into the limiting notch; after the right edge of the transparent protection plate is embedded into the limiting notch, the locking rod end of the electric control lock is pressed on the right edge of the transparent protection plate, and the lower side surface of the right edge of the transparent protection plate is pressed on the triggering end of the tact switch; the microcontroller is respectively and electrically connected with the control end of the electric control switch, the safety indicator lamp, the control end of the electric control lock, the tact switch and the unlocking button.

Furthermore, the electric connection socket comprises a screw rod section, a metal disc and four elastic rods; the lower side surface of the metal disc is fixedly arranged on the end part of the screw section; the four elastic rods are fixedly arranged on the edge of the upper side face of the metal disc and are positioned at the quartering points of the same circumference; the upper ends of the four elastic rods are all inclined towards the inner side, and the upper end surfaces of the elastic rods are arranged on inclined slopes which are convenient for the insertion of the electric connection plug; a cross-shaped groove is formed in the center of the upper side face of the metal disc; screw thread of the screw section is screwed on the platform bottom plate, and the lower side surface of the metal disc is used for pressing the wiring end cable to realize conductive connection.

Further, the electric connection plug comprises a conductive metal rod and an insulating handle sleeve; the insulating handle sleeve is fixedly sleeved on the end part of the conductive metal rod, and an anti-skid convex ring is arranged on the outer wall of the insulating handle sleeve; an extrusion thickening section is arranged in the middle of the conductive metal rod, the edge of the end part, close to the insertion end of the conductive metal rod, of the extrusion thickening section is set to be inserted into an extrusion conical surface, and the edge of the other end part of the extrusion thickening section is set to be an elastic extrusion conical surface.

Furthermore, the outer sides of the upper ends of the four elastic rods are provided with buckle convex teeth; the upper ends of the four elastic rods are arranged in one elastic contraction ring in a penetrating mode, so that the upper ends of the four elastic rods are elastically inclined towards the inner side, and the four buckle convex teeth are used for limiting and blocking the elastic contraction ring.

Furthermore, the upper side surface of the metal disc is provided with a circular arc surface bulge; the insertion end face of the conductive metal rod is provided with an arc concave face matched with the arc surface bulge.

Furthermore, a triangular extrusion block for extruding the elastic extrusion conical surface is arranged on the inner side surface of the middle part of each of the four elastic rods.

Furthermore, an insulating partition plate is arranged between every two adjacent electric connection sockets; each relay is provided with a status indicator lamp.

Furthermore, each positioning slide block is slidably arranged on the T-shaped sliding grooves of the three transverse rails, each positioning slide block is provided with a positioning bolt in a threaded screwing manner, and the end part of the screw rod of each positioning bolt is pressed on the bottom of the T-shaped sliding groove; four top corners of the lower side surface of the platform bottom plate are fixedly provided with a supporting footing.

Compared with the prior art, the utility model, its beneficial effect is: corresponding control switches and relays are arranged on the three transverse rails, so that the implementation of various simulation schemes can be met according to simulation requirements; the electric connection plug is electrically connected with the electric connection socket in a contact mode, so that a user can conveniently and quickly build a circuit, and the efficiency of simulation training is improved.

Drawings

Fig. 1 is a schematic top view of the simulation platform of the present invention;

FIG. 2 is a schematic view of the insertion structure of the electrical connection socket and the electrical connection plug of the present invention;

FIG. 3 is a schematic view of the structure of the electrical connection plug of the present invention;

fig. 4 is a schematic diagram of the structure of the control circuit of the present invention;

FIG. 5 is a wiring diagram of a bridge structure according to an embodiment of the present invention;

fig. 6 is a schematic diagram of the simulation platform wiring of the present invention.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in fig. 1-4, the power switching control experiment table of the present invention comprises: the system comprises a platform bottom plate 1, three transverse rails 2, a power supply box 4, a switching power supply 6, a PLC (programmable logic controller) 12, at least one control switch 7 and at least one relay 26;

the three transverse rails 2 are transversely and fixedly arranged on the upper side surface of the platform bottom plate 1, and T-shaped sliding grooves 3 are transversely arranged on the three transverse rails 2; the power supply box 4 is fixedly arranged on the left side edge of the platform bottom plate 1, and a fuse protector and a leakage protector are arranged in the power supply box 4; a power plug 5 is arranged on the power box 4, and an electric connection cable of the power plug 5 is electrically connected with a power input end of the switching power supply 6; the fuse protector and the leakage protector are connected in series on an electric connection cable of the power plug 5; a T-shaped convex block is arranged at the bottom of each of the switching power supply 6, the PLC 12, each control switch 7 and each relay 26; the switching power supply 6, the PLC 12, each control switch 7 and each relay 26 are arranged on the T-shaped sliding groove 3 of the corresponding transverse track 2 through a T-shaped convex block at the bottom; an electric connection socket 8 is correspondingly arranged on the platform bottom plate 1 and close to a power output terminal of the switching power supply 6, a pin terminal of the PLC 12, a terminal of each control switch 7 and a terminal of each relay 26; a cable placing box 24 is arranged at the front side edge of the platform bottom plate 1; each patch cable 25 and each terminal cable 43 are placed in the cable placing box 24; an electric connection plug 28 is electrically connected to both ends of the patch cable 25; the power supply output terminal of the switching power supply 6, the pin terminal of the PLC controller 12, the terminal of each control switch 7, and the terminal of each relay 26 are electrically connected to each electrical connection socket 8 at the corresponding position, respectively, by terminal cables 43; the electrical connection plug 28 is intended to be plugged into a corresponding electrical connection socket 8, electrically connecting the two electrical connection sockets 8 via the patch cable 25.

The corresponding control switches 7 and relays 26 are arranged on the three transverse rails 2, so that the implementation of various simulation schemes can be met according to simulation requirements; by utilizing the contact-type electric connection between the electric connection plug 28 and the electric connection socket 8, a user can conveniently and quickly build a circuit, and the efficiency of simulation training is improved.

Further, a longitudinal shaft 23 is longitudinally and rotatably installed on the left side edge of the upper side surface of the platform bottom plate 1 through two hinged supports 22; a transparent protection plate 19 is fixedly arranged on the longitudinal shaft 23; a strip-shaped seat 13 is longitudinally and fixedly arranged on the right side of the upper side surface of the platform bottom plate 1 through a fixing screw 15; a limiting notch 14 is arranged on the strip-shaped seat 13; the right edge of the transparent protection plate 19 swings rightwards and then is embedded into the limiting notch 14; a lifting handle 20 is arranged on the transparent protection plate 19; a rectangular window 18 is provided in the transparent shield 19 at the trigger button of the control switch 7. The transparent protection plate 19 can play a role in safety protection when the power-on experiment is carried out after the wiring is completed.

Further, a microcontroller and an electric control switch are arranged in the power supply box 4; the electric control switch is connected in series with an electric connection cable of the power plug 5; a safety indicator lamp 42 is arranged on the upper side surface of the power supply box 4; a tact switch 16 is arranged at the bottom of the limiting notch 14; an electric control lock 17 is fixedly arranged on the right side edge of the strip-shaped seat 13, and the lock rod end of the electric control lock 17 extends into the limiting notch 14; after the right edge of the transparent protection plate 19 is embedded into the limiting notch 14, the locking rod end of the electric control lock 17 is pressed on the right edge of the transparent protection plate 19, and the lower side surface of the right edge of the transparent protection plate 19 is pressed on the triggering end of the tact switch 16; the microcontroller is electrically connected with the control end of the electric control switch, the safety indicator lamp 42, the control end of the electric control lock 17, the tact switch 16 and the unlocking button 44 respectively. The safety indicator lamp 42 can be used for carrying out green light prompt after the electric control lock 17 is locked and the tact switch 16 senses that the transparent protection plate 19 is covered, so that the use safety is improved; the power supply of the switching power supply 6 can be switched on by using the electric control switch under the condition that the safety indicator lamp 42 indicates a green light. Microcontroller adopts current single chip microcomputer control module, electric control lock 17 adopts current electro-magnet, drive locking lever axial motion through the electromagnetic mode, realize unblanking through the button 44 of unblanking when using, by microcontroller control electric control lock 17's locking lever retraction, open transparent guard plate 19, the user can carry out the wiring operation, the back is accomplished in the wiring, close transparent guard plate 19, touch switch 16 receives touch signal, microcontroller control electric control lock 17 is closed and safety indicator 42 is green light after gathering touch signal.

Further, the electrical connection socket 8 comprises a screw section 29, a metal disc 30 and four elastic rods 31; the lower side of the metal disc 30 is fixedly arranged on the end of the screw section 29; four elastic rods 31 are fixedly arranged on the edge of the upper side surface of the metal disc 30 and are positioned at the quartering points of the same circumference; the upper ends of the four elastic rods 31 are all inclined inwards, and the upper end surfaces of the elastic rods 31 are arranged into inclined slopes for inserting the electric connection plug 28 conveniently; a cross-shaped groove 41 is arranged at the center of the upper side surface of the metal disc 30; the screw section 29 is screwed to the platform floor 1, and the lower side of the metal disk 30 is used to press on the terminal cable 43 for an electrically conductive connection. The screw section 29 can be conveniently and spirally installed on the platform bottom plate 1, and the wiring terminal cable 43 can be conveniently installed and detached; the cross-shaped groove 41 enables the screw section 29 to be installed by existing tools; the four elastic rods 31 are inclined inward to elastically clamp the inserted electrical connection plug 28, thereby realizing the conductive connection.

Further, the electrical connection plug 28 includes a conductive metal rod 37 and an insulating handle sleeve 35; the insulating handle sleeve 35 is fixedly sleeved on the end part of the conductive metal rod 37, and the outer wall of the insulating handle sleeve 35 is provided with an anti-skid convex ring 36; an extrusion thickening section is arranged in the middle of the conductive metal rod 37, the end edge of the extrusion thickening section close to the insertion end of the conductive metal rod 37 is provided with an insertion extrusion conical surface 39, and the other end edge of the extrusion thickening section is provided with an elastic extrusion conical surface 38. After the conductive metal rod 37 is inserted, the elastic extrusion conical surface 38 can be conveniently extruded by the four inclined elastic rods 31, so that the axial extrusion force is realized, and the conductive metal rod 37 is ensured to be in close conductive contact with the metal disc 30; the conductive metal rods 37 can be conveniently inserted into the clamping space between the four elastic rods 31 by inserting the extrusion conical surface 39; the use of the insulated handle sleeve 35 and the slip-resistant bead 36 facilitates the insertion of the conductive metal rod 37.

Furthermore, the outer sides of the upper ends of the four elastic rods 31 are provided with buckling convex teeth 32; the upper ends of the four elastic rods 31 are arranged in one elastic shrinkage ring 33 in a penetrating manner, so that the upper ends of the four elastic rods 31 are elastically inclined towards the inner side, and the four buckling convex teeth 32 are used for limiting and blocking the elastic shrinkage ring 33. The elastic clamping force of the upper ends of the four elastic rods 31 is enhanced by utilizing the capacity of the elastic contraction ring 33, so that the conductive reliability is ensured; the elastic contraction ring 33 can be prevented from being separated from the upper end of the elastic conductive rod 31 by the snap tooth 32.

Further, the upper side surface of the metal disc 30 is provided with a circular arc surface bulge; the insertion end surface of the conductive metal rod 37 is provided with a circular arc concave surface 40 which is matched with the circular arc surface bulge. The contact area can be increased and the conductivity can be enhanced by the tight fit of the arc surface protrusion and the arc concave surface 40.

Further, a triangular extrusion block 34 for extruding the elastic extrusion conical surface 38 is arranged on the inner side surface of the middle part of each of the four elastic rods 31. By means of the extrusion fit of the triangular extrusion block 34 and the elastic extrusion conical surface 38, the axial elastic extrusion of the conductive metal rod 37 can be realized, so that the conductive metal rod 37 and the metal disc 30 realize stable conductive contact.

Further, an insulating partition plate 9 is arranged between every two adjacent electric connection sockets 8; each relay 26 is provided with a status indicator lamp 27. The use of the status indicator lights 27 facilitates viewing the current status of the relay 26 during simulation.

Furthermore, each positioning slide block 10 is slidably mounted on the T-shaped sliding groove 3 of each of the three transverse rails 2, each positioning slide block 10 is threadedly and rotatably mounted with a positioning bolt 11, and the end of the screw of the positioning bolt 11 is pressed on the bottom of the T-shaped sliding groove 3; four top corners of the lower side surface of the platform bottom plate 1 are fixedly provided with a supporting foot 21. The positioning slide block 10 and the positioning bolt 11 can be used for clamping and positioning the electrical equipment on the transverse rail 2.

As shown in fig. 5, a wiring diagram of a bridge structure is adopted for a high-voltage incoming line main topology of a certain subway station, wherein the meaning of each switch device is shown in table 1.

TABLE 1

The simulation operation flow is simulated by taking normal operation of a system and partial equipment faults as an example, and specifically comprises the following steps:

(1) simulating normal operation of equipment

The operation conditions S1 and S2 are fault-free, and except that the grounding disconnecting switches 0015 and 0025 and the circuit breaker 003 are in an off state, other switches and circuit breakers are in a closing state. Lines #1 and #2 are now operating in tandem.

(2) Normal switching operation of simulation equipment

In the operation process, the line S1 has a fault, the line S2 has no fault, two outgoing lines of the substation are provided by the line S2 for reliable operation of the system, the breaker 001 is opened, the breaker 003 is closed, and meanwhile, the disconnecting switches 0011 and 0012 are opened.

(3) Simulating open circuit to get 001 fault

Isolation switches 0011, 0012 and 0013 on S1 are normal, grounding switch 0015 is normal, and all devices on S2 are normal. And opening a 001 breaker, closing a breaker 003, opening a disconnecting switch 0012 and closing a grounding switch 0015, and repairing the breaker 001 after the grounding is ensured to be complete. After the repair is completed, the grounding switch 0015 is disconnected, the disconnecting switches 0011 and 0012 and the circuit breaker 001 are sequentially closed, and then the circuit breaker 003 is disconnected, so that the maintenance composition of the fault of the circuit breaker 001 is realized.

(4) Simulating isolator 0011 fault

And S1 power failure of the side substation, the breaker 001 in S1 is normal, the disconnecting switches 0012 and 0013 are normal, and all the devices in S2 are normal. The circuit breaker 003 is closed, the circuit breaker 001 is opened, and before the disconnecting switch 0011 is repaired, the grounding before and after the switch 0011 is ensured to be good. After the repair is completed, the grounding circuit is cancelled, the circuit 0011 is closed, the breaker 001 is closed, and the circuit 003 is disconnected, so that the maintenance composition of the fault of the isolating switch 0011 is realized. At this time, the power supply of the line transformer is completely provided by the line #2, and it can be seen that the lines #1 and #2 are mutually standby at this time, so that the reliability of power supply is improved.

(5) Simulating isolator 0012 fault

And in S1, the disconnecting switches 0011 and 0013 are normal, the breaker 001 is normal, the grounding switch 0015 is normal, and all the equipment in S2 are normal. Closing circuit breaker 003, breaking circuit breaker 001, closing earthing switch 0015, repairing isolator 0012, breaking earthing switch 0015, closing circuit breaker 001, breaking circuit breaker 003, thus the maintenance of isolator 0012 trouble is compound 1 has been realized.

(6) Simulating isolator 0013 fault

And S1 power failure of the side substation, the breaker 001 in S1 is normal, the disconnecting switches 0011 and 0012 are normal, the grounding switch 0015 is normal, and all the devices in S2 are normal. Closing the circuit breaker 003, disconnecting the disconnecting switch 0012, repairing the disconnecting switch 0013, closing the disconnecting switch 0012 and disconnecting the circuit breaker 003, thereby realizing the maintenance composition of the fault of the disconnecting switch 0013.

(7) Simulating isolator 0021 fault

And S2 power failure of the side substation, the circuit breaker 002 on S2 is normal, the isolation switches 0022 and 0023 are normal, and all the equipment on S1 are normal. Closing the circuit breaker 003, breaking the circuit breaker 002, repairing the isolating switch 0021, closing the circuit breaker 002, breaking the circuit and getting 003, thereby realizing the maintenance of the isolating switch 0021 fault.

(8) Simulating circuit break to get 002 fault

On S2, isolation switches 0021, 0022 and 0023 are normal, grounding switch 0025 is normal, and all devices on S1 are normal. Closing circuit breaker 003, breaking isolator 0022, closing earthing switch 0025, repairing circuit breaker 002, breaking earthing switch 0025, closing isolator 0022, disconnection circuit breaker 003 to the maintenance that has realized the trouble to circuit breaker 002 is compound.

(9) Simulating isolator 0022 fault

The isolation switches 0021 and 0023 are normal on S2, the breaker 002 is normal, the grounding switch 0025 is normal, and all the devices on S1 are normal. Closing circuit breaker 003, breaking circuit breaker 002, closing earthing switch 0025, repairing isolator 0022, breaking earthing switch 0025, closing circuit breaker 002, breaking circuit breaker 003 to the maintenance that has realized the trouble to isolator 0022 is compound.

(10) Simulating isolator 0023 fault

The power failure of the side substation is performed by S2, the breaker 002 on S2 is normal, the isolating switches 0021 and 0022 are normal, the grounding switch 0025 is normal, and all the devices on S1 are normal. Closing circuit breaker 003, breaking isolator 0022, repairing isolator 0023, closing isolator 0022, breaking circuit breaker 003 to the maintenance that has realized the isolator 0023 trouble is compound.

As shown in FIG. 6, PLC controller 12 is an FX2N-128-MR PLC model; six control switches 7 are arranged, and a control switch provided with a control button is adopted; the relays 26 are provided in total with thirteen relays, with status indicators 27. The analog system primary system components and functional comparison are shown in table 2. The PLC controller 12, six control switches 7, and thirteen relays 26 are electrically connected by respective patch cables 25 and respective terminal cables 43 to constitute a circuit diagram as shown in fig. 6, the control switches 7 being used for simulating control switches of a control room, and the relays 26 being used for simulating circuit breakers, disconnectors, and grounding switches.

TABLE 2

As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a power switching control experiment table which characterized in that: the power supply comprises a platform bottom plate (1), three transverse rails (2), a power supply box (4), a switching power supply (6), a PLC (programmable logic controller) controller (12), at least one control switch (7) and at least one relay (26);

the three transverse rails (2) are transversely and fixedly arranged on the upper side surface of the platform bottom plate (1), and T-shaped sliding grooves (3) are transversely arranged on the three transverse rails (2); the power supply box (4) is fixedly arranged on the left side edge of the platform bottom plate (1), and a fuse protector and a leakage protector are arranged in the power supply box (4); a power plug (5) is arranged on the power box (4), and an electric connection cable of the power plug (5) is electrically connected with a power input end of the switch power supply (6); the fuse protector and the leakage protector are connected in series on an electric connection cable of the power plug (5); a T-shaped convex block is arranged at the bottom of each switch power supply (6), the PLC (12), each control switch (7) and each relay (26); the switch power supply (6), the PLC (12), each control switch (7) and each relay (26) are arranged on the T-shaped sliding groove (3) of the corresponding transverse track (2) through a T-shaped convex block at the bottom; an electric connection socket (8) is correspondingly arranged on the platform bottom plate (1) and close to a power output terminal of the switching power supply (6), a pin terminal of the PLC (12), a terminal of each control switch (7) and a terminal of each relay (26); a cable placing box (24) is arranged on the front side edge of the platform bottom plate (1); each patch cable (25) and each terminal cable (43) are placed in the cable placing box (24); two ends of the plug cable (25) are electrically connected with an electric connection plug (28); the power output terminal of the switching power supply (6), the pin terminal of the PLC (12), the terminal of each control switch (7) and the terminal of each relay (26) are respectively and electrically connected with each electric connection socket (8) at the corresponding position through a terminal cable (43); the electrical connection plug (28) is intended to be plugged into a corresponding electrical connection socket (8) and electrically connects the two electrical connection sockets (8) by means of a patch cable (25).

2. The power supply switching control experiment table according to claim 1, wherein: a longitudinal shaft (23) is longitudinally and rotatably arranged on the left side edge of the upper side surface of the platform bottom plate (1) through two hinged supports (22); a transparent protection plate (19) is fixedly arranged on the longitudinal shaft (23); a strip-shaped seat (13) is longitudinally and fixedly arranged on the right side of the upper side surface of the platform bottom plate (1) through a fixing screw (15); a limiting notch (14) is arranged on the strip-shaped seat (13); the right edge of the transparent protection plate (19) swings rightwards and then is embedded into the limit notch (14); a lifting handle (20) is arranged on the transparent protection plate (19); a rectangular window (18) is arranged on the transparent protection plate (19) and positioned at the trigger button of the control switch (7).

3. The power supply switching control experiment table according to claim 2, wherein: a microcontroller and an electric control switch are arranged in the power supply box (4); the electric control switch is connected in series with an electric connection cable of the power plug (5); a safety indicator lamp (42) is arranged on the upper side surface of the power supply box (4); a tact switch (16) is arranged at the bottom of the limiting notch (14); an electric control lock (17) is fixedly arranged on the right side edge of the strip-shaped seat (13), and the lock rod end of the electric control lock (17) extends into the limiting notch (14); after the right edge of the transparent protection plate (19) is embedded into the limiting notch (14), the locking rod end of the electric control lock (17) is pressed on the right edge of the transparent protection plate (19), and the lower side surface of the right edge of the transparent protection plate (19) is pressed on the triggering end of the tact switch (16); the microcontroller is respectively and electrically connected with the control end of the electric control switch, the safety indicator lamp (42), the control end of the electric control lock (17), the tact switch (16) and the unlocking button (44).

4. The power supply switching control experiment table according to claim 1, wherein: the electric connection socket (8) comprises a screw rod section (29), a metal disc (30) and four elastic rods (31); the lower side surface of the metal disc (30) is fixedly arranged on the end part of the screw section (29); four elastic rods (31) are fixedly arranged on the edge of the upper side surface of the metal disc (30) and are positioned at the quartering points of the same circumference; the upper ends of the four elastic rods (31) are all inclined inwards, and the upper end surfaces of the elastic rods (31) are arranged into inclined slopes for inserting the electric connection plug (28) conveniently; a cross-shaped groove (41) is arranged at the center of the upper side surface of the metal disc (30); the screw section (29) is installed on the platform bottom plate (1) in a threaded screwing mode, and the lower side face of the metal disc (30) is used for pressing the wiring terminal cable (43) to achieve conductive connection.

5. The power supply switching control experiment table according to claim 4, wherein: the electrical connection plug (28) comprises a conductive metal rod (37) and an insulating handle sleeve (35); the insulating handle sleeve (35) is fixedly sleeved on the end part of the conductive metal rod (37), and an anti-skid convex ring (36) is arranged on the outer wall of the insulating handle sleeve (35); an extrusion thickening section is arranged in the middle of the conductive metal rod (37), the edge of the end part of the extrusion thickening section, which is close to the insertion end of the conductive metal rod (37), is provided with an insertion extrusion conical surface (39), and the edge of the other end part of the extrusion thickening section is provided with an elastic extrusion conical surface (38).

6. The power supply switching control experiment table according to claim 5, wherein: the outer sides of the upper ends of the four elastic rods (31) are provided with buckling convex teeth (32); the upper ends of the four elastic rods (31) penetrate through the elastic contraction ring (33), so that the upper ends of the four elastic rods (31) elastically incline towards the inner side, and the four buckling convex teeth (32) limit and block the elastic contraction ring (33).

7. The power supply switching control experiment table according to claim 5, wherein: the upper side surface of the metal disc (30) is provided with a circular arc surface bulge; the insertion end surface of the conductive metal rod (37) is provided with an arc concave surface (40) matched with the arc surface bulge.

8. The power supply switching control experiment table according to claim 5, wherein: the inner side surfaces of the middle parts of the four elastic rods (31) are respectively provided with a triangular extrusion block (34) for extruding an elastic extrusion conical surface (38).

9. The power supply switching control experiment table according to claim 1, wherein: an insulating partition plate (9) is arranged between every two adjacent electric connection sockets (8); each relay (26) is provided with a status indicator lamp (27).

10. The power supply switching control experiment table according to claim 1, wherein: each positioning slide block (10) is arranged on the T-shaped sliding groove (3) of the three transverse rails (2) in a sliding mode, each positioning slide block (10) is provided with a positioning bolt (11) in a threaded and screwed mode, and the end portion of the screw rod of each positioning bolt (11) is pressed on the bottom of the T-shaped sliding groove (3); four top corners of the lower side surface of the platform bottom plate (1) are fixedly provided with a supporting footing (21).

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